Chap, i.] Wiongte. 419 



An idea, compounded of feveral fimple ideas, is called 

 a complex idea, as man, horfe, tree, &c. which are evi- 

 dently compounds of a number of fimple ideas of 

 figure, colour, folidity, &c. and fometimes for diftinc- 

 tion's fake, when many complex ideas are compounded 

 in one, the dilciples of Mr. Locke call it a decomplex 

 idea, as homicide. 



Impreffions on the fenfes are often fo entwined or 

 aflociared together, that the idea of the one fhall not 

 be recollected without that of the other. This junc- 

 tion happens when two impre (lions are made on the 

 fenfes at the fame time : thus the wb'itenefs and rouvd- 

 nejs of a globe may be afibciated ; the form and the 

 found of a mufical inftrument ; the name with the 

 thing, fo that on the fight of the thing or object we 

 immediately recollect the name. Ideas may affociate 

 with impreflions, if an imprefllon is "made on any of 

 the fenfes, while an idea is predominant in the mind. 

 Thus the fight of a particular place will often recal 

 fome interefting train of thought, that may have been 

 entertained there. When I fpeak of ideas being aflb- 

 ciated, connected, combined, &c. I would be under- 

 itood of the fame thing, viz. the implexion or junction 

 of ideas thus explained. 



The retention of ideas in the mind is called memory. 

 The act of combining old ideas into new ones, inven-' 

 lion, and frequently imagination or fancy. The act of 

 examining and comparing them judgment Under thefe 

 heads I propofe explaining the primary operations of 

 the mind, and thefe will constitute the firft part of the 

 prefent inquiry. 



The fecond part of this book will confift of an in- 

 quiry into the common fprings of action in the mind. 

 Thefe I fhall endeavour to prove to be ultimately the 

 fenfes Qtplsajurc and pain. Low is the idea of pieafure, 

 e 2 combined 



